On Sat, Aug 23, 2008 at 12:18 AM, Ian Dees <[EMAIL PROTECTED]> wrote:

> How about an activity feed for a certain bounding box area? I think this, in
> combination with the user-specific activity log, would be very useful.

There's a simple trick to achieve this : XOR or subtractive rendering.
Relatively simple to implement with slippy map tiles and desktop
renderers.

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